45 lines
1.8 KiB
Python
45 lines
1.8 KiB
Python
import re
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from urllib.parse import urlsplit, parse_qs
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from django.forms import ValidationError
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def validate_url(url, validator):
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'''
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Validate a URL against a dict of validation requirements. Returns an extracted
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part of the URL if the URL is valid, if invalid raises a ValidationError.
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'''
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valid_scheme, valid_netloc, valid_path, valid_query, extract_parts = (
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validator['scheme'], validator['domain'], validator['path_regex'],
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validator['qs_args'], validator['extract_key'])
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url_parts = urlsplit(str(url).strip())
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url_scheme = str(url_parts.scheme).strip().lower()
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if url_scheme != valid_scheme:
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raise ValidationError(f'scheme "{url_scheme}" must be "{valid_scheme}"')
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url_netloc = str(url_parts.netloc).strip().lower()
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if url_netloc != valid_netloc:
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raise ValidationError(f'domain "{url_netloc}" must be "{valid_netloc}"')
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url_path = str(url_parts.path).strip()
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matches = re.findall(valid_path, url_path)
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if not matches:
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raise ValidationError(f'path "{url_path}" must match "{valid_path}"')
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url_query = str(url_parts.query).strip()
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url_query_parts = parse_qs(url_query)
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for required_query in valid_query:
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if required_query not in url_query_parts:
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raise ValidationError(f'query string "{url_query}" must '
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f'contain the parameter "{required_query}"')
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extract_from, extract_param = extract_parts
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extract_value = ''
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if extract_from == 'path_regex':
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try:
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submatches = matches[0]
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try:
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extract_value = submatches[extract_param]
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except IndexError:
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pass
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except IndexError:
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pass
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elif extract_from == 'qs_args':
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extract_value = url_query_parts[extract_param][0]
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return extract_value
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